Is this normal? Blue stuff ontop of water in my softener

What is the silver round thing to the right with white top and bottom? Also feel free to rate/critique the install! Thanks in Advance!

What is this?

What is the purpose of this? Preface by saying I know nothing about plumbing…

Drops from waste pipe.

Hello! I have water appearing in a few fittings from a waste pipe I fitted. Should I be looking to stop the drips before using solvent… or will the solvent fix the problem? Thanks.

Filling the gap at base of acrylic tub

The original plumber who set the tub was fired from the job. They came and tiled the floor. New plumber finished the house and did not touch the tub. My wife is worried about getting water under it before we move in. Is there anyway to seal it that looks visually nice besides a very large line of caulk?

What is this? #2

Another round of “what is this”? What is that black thing? It’s in my basement.

Help with shower head leak

Water is shooting out of the blue area. Is that just a seal ?thanks for the help

What is this.. growth?

What would cause this formation or growth? Almost looks crystallized? Noticed it about 2 months ago and it was the size of a quarter but now is much larger. Can it be the result the a small leak no (we do have very hard water,but no evidence of water down below)? I am afraid to “break off” or displace whatever is there for fear of an open leak.

Dishwasher Water Hammer Arrestor

I'm replacing my dishwasher supply line and considering adding an arrestor to eliminate some of the water hammer that occurs when I run the dishwasher. Do these devices actually help, or create more problems than they solve?

What is this at the end of my pipe?

This is buried up in my basement wall near the exterior of the home. The opposite side of the T is my sprinkler shut off valve that I need to move. Plumber is coming in a few days, but I'd like to know what this is before he shows in case I have to remove more drywall for him to work. Thanks in advance.

What is this?

This is in I’m back yard in a round valve box in the ground in my back yard. Looks like some sort of valve. What are these typically used for?